Wording Changes from Ada 95

{AI95-00326-01}
{AI05-0299-1}
This subclause clause is new. This is necessary as interface is now a reserved word,
which would prevent pragma Interface from being an implementation-defined
pragma. We don't define any semantics for this pragma, as we expect that
implementations will continue to use whatever they currently implement
- requiring any changes would be counter-productive.